UPC4570

Dual BJT-Input Op-Amp DIP-8 / SOIC-8.5 circuits use this part.

Datasheet · archived copy from NEC; the part is discontinued and the maker no longer publishes it

Substitutes same socket

Parts that fit the same socket: the same function, pin count and pinout. The figures are read off each part's datasheet (this one's from page 3), typical where the sheet gives a typical value, otherwise the maximum. Closest first; the last column says what differs. A different part can change the sound, and a circuit may lean on one particular figure, so read the build document's notes before you swap.

This part

Part	Input	Supply	GBW	Slew	Noise	Iq	Boards
UPC4570	bipolar	8–32 V	15 MHz	7 V/µs		2.5 mA	5

Low-noise, wideband audio dual; needs at least ±4 V (8 V) supply.

Fits the same socket

Part	Input	Supply	GBW	Slew	Noise	Iq	Boards	Differs
LM833	bipolar	10–36 V	16 MHz	7 V/µs	4.5 nV	2.05 mA	144	rated from 10 V. Low-noise audio dual; needs at least ±5 V (10 V) and draws about 2 mA per amplifier.
4580	bipolar	4–36 V	15 MHz	5 V/µs		3 mA	103	Low-noise, high-output-current audio dual from ±2 V; the DIP8 (NJM4580D) is listed as discontinued.
NE5532	bipolar	10–30 V	12 MHz	5 V/µs	5 nV	3 mA	155	rated from 10 V. Low noise and strong output drive, but draws about 3 mA per amplifier and has 200 nA bias current.
NJM2100	bipolar	2–7 V	12 MHz	4 V/µs		1.75 mA	1	7 V max, not for 18 V. Low-voltage dual op-amp rated to ±3.5 V (7 V total), so it cannot run straight from 9 V.
NJM4565D	bipolar	8–36 V	10 MHz	4 V/µs		2.25 mA	2	Drives 20 V peak-to-peak into 400 Ω; the DIP8 (NJM4565D) is listed as discontinued.
OPA1678	RR out	4.5–36 V	16 MHz	9 V/µs	4.5 nV	2 mA	6	rail-to-rail output. Surface-mount only (SOIC-8 and smaller), so a DIP socket needs an adapter; standard dual pinout.
M5216		4–32 V	10 MHz	3 V/µs		2.25 mA	4	High-current dual (±100 mA load) meant for headphone drivers.
LM4562	bipolar	5–34 V	55 MHz	20 V/µs	2.7 nV	5 mA	8	Very low noise and distortion, but 55 MHz GBW and 10 mA total supply current; needs a tight layout and decoupling.
4558	bipolar	10–30 V	4 MHz	2.2 V/µs	7 nV	1.25 mA	1164	rated from 10 V. Bipolar input with about 80 nA bias current, so it needs a DC bias path on each input.
4559	bipolar	?–36 V	4 MHz	2 V/µs		1.65 mA	29	Audio dual with stronger output drive than a 4558 (±10 V into 600 Ω).

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Flange-A-Rama 2SA1015Y · 2SC2458BL · C4570C · MN3102 Ibanez FL-99 flanger · 1590J	Ibanez FL-99 flanger	Flanger	Dead End FX	1590J	4	$20.00	123
Inchindown Redux 2N3904 · 2SA1015Y · 2SC1815BL · 74HCU04N Ibanez EM5 Echomachine · 1590J	Ibanez EM5 Echomachine	Vibrato / Chorus	Dead End FX	1590J	6	$15.00	101
Mangel Wurzel 2SC1015 · 2SC2458 · MN3102 · MN3207 1590BBS	—	Vibrato / Chorus	Dead End FX	1590BBS	4	$20.00	111
Ibanez EM5 Echomachine Delay Vero34×31 Verified 2N3906 · 2N5088 · 74HCU04N · 78L05 Ibanez EM5 Echomachine	Ibanez EM5 Echomachine	Delay	Dirtbox Layouts	—	3	—	48
Ibanez EM5 2SA1015Y · 2SC1815BL · 2SC1815GR · 2SK118O Ibanez EM5 Echomachine	Ibanez EM5 Echomachine	Delay	Experimentalists Anonymous	—	—	—	111